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  #11  
Old 12-27-2019, 10:30 AM
N941WR's Avatar
N941WR N941WR is offline
 
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Location: SC
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Quote:
Originally Posted by rocketbob View Post
Pull auto plug wires and check the ends are screwed on tight on the plugs.
You should not run plugs with screw on caps. If you are replace them with similar plugs with solid caps. That said, I doubt your issue is ignition related.

Good luck!
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  #12  
Old 12-27-2019, 11:17 AM
VIN2020 VIN2020 is offline
 
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Location: Fort Worth
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Quote:
Originally Posted by N941WR View Post
You should not run plugs with screw on caps. If you are replace them with similar plugs with solid caps. That said, I doubt your issue is ignition related.

Good luck!
Agreed.

The one test I didn't do is run on one mag for enough time on each mag independently to determine if it was truly mag dependent some how.
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  #13  
Old 12-30-2019, 10:19 PM
VIN2020 VIN2020 is offline
 
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Boyd,
Please read your private message,i still need to understand what you observed and compare to mine. I also need to understand the exact change you made.
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  #14  
Old 01-19-2020, 10:14 PM
VIN2020 VIN2020 is offline
 
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Location: Fort Worth
Posts: 31
Default RV-7 AOG West Memphis - Solution was a new cylinder

A quick update:

I learned how to do a compression check by pulling the prop through (Thank you Walt). I realized the number four cylinders intake valve was leaking. I could hear the compression stroke air come out through the carburetor (something to add to my check list before l start long journeys).

I ended up buying a brand new Lycoming cylinder (so long to one of my four ECI cylinders with the 50hr AD inspection requirement)

Justin at Ultimate Aircraft Services (M01 - General DeWitt Spain Airport) was awesome. He replaced out my number 4 cylinder and did the initial run.

A few days later when I could make it back to West Memphis, I did the initial 30min break-in flight at full takeoff power (I have never done that before and man does that RV-7 go).

De-cowled and everything looked good, got back in the plane and flew it for 6 hours (Memphis to Midland to Fort Worth).

The plane never stumble again, so it seems fairly clear the whole stumbling issue was because of the leaking intake valve.

Thank you all for your assistance. It was very humbling for all those who reached out to help and cared what was happening (especially for a fiercely independent person as myself).

What a great community of fellow aviators we have.
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Last edited by VIN2020 : 01-19-2020 at 10:20 PM.
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  #15  
Old 01-20-2020, 05:52 PM
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rjcthree rjcthree is online now
 
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Location: Bay Village, OH
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Default Valve leaking - why?

Congrats on getting back in the air. Did anything look wrong with the offending valve/cylinder?
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  #16  
Old 01-20-2020, 08:40 PM
VIN2020 VIN2020 is offline
 
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The intake valve looks a little suspect and hard to tell if it is not seated correctly. I will need a week before I can get around to disassembling it for a closer look. I will post back with more information when I have it.
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  #17  
Old 01-21-2020, 10:14 AM
hrhodes2@comcast.net hrhodes2@comcast.net is offline
 
Join Date: Oct 2009
Location: TN
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Default Paging Walt

Walt would you pm me with pulling prop through technique? Thx Howard Rhodes

Last edited by hrhodes2@comcast.net : 01-21-2020 at 10:38 AM.
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